Lambda Cygni
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 47m 24.53766s [1] |
| Declination | 36° 29′ 26.5737″ [1] |
| Apparent magnitude (V) | 4.54 [2] |
| Characteristics | |
| Spectral type | B5V [3] |
| U−B color index | -0.50 [2] |
| B−V color index | -0.11 [2] |
| Astrometry | |
| Radial velocity (Rv) | -23.20[4] km/s |
| Proper motion (μ) | RA: +14.71[5] mas/yr Dec.: -8.96[5] mas/yr |
| Parallax (π) | 4.24 ± 0.43[1] mas |
| Distance | approx. 770 ly (approx. 240 pc) |
| Absolute magnitude (MV) | -2.32 [6] |
| Details | |
| Radius | 3.56 [7] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Lambda Cygni (λ Cyg) is a class B5V[3] (blue main-sequence) star in the constellation Cygnus. Its apparent magnitude is 4.54[2] and it is approximately 770 light years away based on parallax.[1]
Lambda Cygni is a multiple star, with components A, B, and C observed in the 19th century; the main component, A, is a spectroscopic binary itself with two components Aa and Ab reported at magnitudes 5.4 and 5.8 orbiting with a period of 12 years.[8] Component B has type B7V, magnitude 6.26, and separation 0.77" (about 180 AU based on parallax).[9][8] Component C has reported type K2III-IV, apparent magnitude 9.65, and separation about 85".[10] Recent observations indicate the presence of additional smaller companions D (about 50" from A), E (about 8" from C), and F (about 40" from C) all around apparent magnitude 14.[10]
References
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- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Absolute magnitude calculated as
, where 
is the star's absolute magnitude, 
is the star's apparent magnitude, and 
is the star's measured parallax in arcseconds. - ↑ Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 10.0 10.1 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
